Coating table for coating machines



Oct. 13, 1931. 5. CASE COATING TABLE FOR COATING MACHINES Original Filed June 11, 1926 3 Sheets-Sheet l Oct. 13, 1931. 5, CASE 1,827,640

COATING TABLE FOR COATING MACHINES Original Filed June 11, 1926 I5 Sheets-Sheet 2 Oct. 13, 1931.

L. B. CASE COATING TABLE FOR COATING MACHINES Original Filed June 11, 1926 3 Sheets-Sheet 3 Patented Oct. 13, 1931 UNITED STATES LYNN B. CASE, OF NEW BRUNSWICK, NEW J ASSIGNOR TO JOHN WALDRON COR- PORATION, 01? NEW BRUNSWICK, NEW JERSEY, A CORPORATION OF NEW JERSEY COATING TABLE FOR COATING MACHINES Original application filed Julie 11, 1926, Serial No. 115,398. Divided and this application filed December 13,

1928. Serial This application is a division of application Serial No. 115,398, filed June 11, 1926.

The principal object of my invention is to provide an improved machine for coating web materials, including various papers and fabrics where it is desired to treat the surface thereof, for the purpose of filling the pores of the material and for various other reasons well known to those familiar with the art.

One object of my invention is to provide an improved coating table over which the material passes, the table being of arcuate form, on which the material being coated is maintained in a taut and even condition, thereby I thereof.

Another improved feature of the invention is the for causing the material being travel over the coating table, and a. vacuum or suction box co'operatm a perforated belt which engages the web material, causing it to adhere to the perforated belt while passing over the vacuum box, the perforated belt being operatively and synchronously connected to the conveying apron, which is driven at its delivery end from a suitable source of power.

Another object of the invention is to pro vide a suitable device for applying the coating material to the web material and driving the color applying apparatus by means of the conveying apron, from its receiving end.

Improved means is also provided for controlling the amount of braking friction on the roll of stock in order to maintain the proper amount of tension on the web material as it passes through the coating machine.

1 also provide improved means by which the stock to be coated may be quickly and eiiici- 'ently threaded through the machine, including means for lowering the coating table out of contact with the vibrating brushes whereby the operator may conveniently thread the web material therebetween.

Another feature of the invention is to provide chilled iron rolls over which the web material passes, at the point where the coating material is applied thereto, the purpose of the chilled rolls being to prevent or reduce eroding of therolls by the action of coating material, which in many instances is of a gritty nature.

Other objects and details of construction of the invention will be more fullydisclosed hereinafter, reference being had to the accompanying drawings, of which:

Fig. l is a side elevation of my improved coating machine;

F in. 2 is a longitudinal sectional elevation of one end of the machine, drawn on somewhat of an enlarged scale;

Fig. 3 is a transverse sectional elevation taken along the line 3-3 of Fig. 1; and

Fig. 4L is a longitudinal sectional elevation of the suction box, and its co-operating perforated belt forming a detail of the invention,

Referring to Fig. l of the drawings, one of the side frames of the machine is illustrated at 1, it being understood that a similar frame 1a is located at the opposite side of the machine for providing a suitable support for the elements of the machine.

The web material to be coated is placed upon the machine in the form of a roll w, being rotatably mounted on the side frames, and placed under the control of braking mechanism hereinafter more fully described, and whereby the rotation of the roll a: is retarded. The material passes froin the roll a: in the form of a web 21 under a guide roll 2 rotatably mounted on the side frames 1, 1a to and over a second guide roll 3, also rotatably mounted on the side frames, thereafter passing under a guide roll 4 rotatably mounted in lmarings 5, 5, which are adjustably mounted on the side frames 1, 1. The web 00 passes over a guide roll 6 rotatably mounted in the side frames, and under a chilled iron roll 7, provided with trunnions 8 and 9, rotatably mounted in suitable bearings 10 and 11 secured to the side frames 1 and 1a of the machine. I

Parallel to and adjacent the roll 7 is a hollow or pipe roll 12 which is provided-With trunnions 13 and 14 rotatably mounted in the bearings 10 and 11 respectively. The roll 12 supports one end of an apron 15 which may be composed of rubber or other suitable material, the opposite end of which passes around and is supported bya second pipe roll 16 provided with trunnions 17 mounted in bearings 19, which are adjustably mounted on the side frames 1 and 1a, for the purpose of adjusting the tension of the apron 15.

Upon referring to Fig. 2 of the drawings, it will be noted that the roll 12 occupies a position in a horizontal plane considerably below that of the roll 16.

Intermediate the rolls 12 and 16, I provide my improved coating table 20 over which the apron 15 passes, the web w also passing over the table 20 in contact with the upper surface of the apron 15. The web .12 passes from the apron 15 onto a perforated belt 21, rotatably supported on rollers 23 and 24 suitably mounted on theframes 1 and 1a.

Intermediate the-rolls 23 and 24, I provide a vacuum box 25 which'produces a suction through the perforations of that portion of the belt 21 immediately overlying the vacuum box 25. The web w, in passing from the apron 15, lies in contact with the upper run "of the belt 21, and by means of the vacuum contact with the belt 21.

The coating material is applied to the Web a immediately adjacent the chilled roll 7 by means of a revolving brush 26, the brush 26 receiving a supply of coating material from a tank 27 by means of a color roll 28 which is'maintained at aposition partially submerged in the material within the tank box 25 is maintained in substantially rigid 27, and in contact with the brush 26.

Initial "s reading of the coating material is effected y means of a stationary brush 29 adj ustably mounted on the side frames 1 and 1a, and immediately overlying one end of the coating table 20 and in contact'with the web of material as it passes over the chilled roll 7 and onto the apron 15.

Uniform distribution of the coating mate-- rial is accomplished by means of a series of batteries of vibrating brushes illustrated at 30, 31 and 32 of Fig. 2. In the present instance, each of the batteries 30, 31 and 32 comprises a series of brushes 35, 36 and 37. Each ofthe brushes comprises bristles 38 suitably secured in a back 39. The back 39 of each of the brushes is secured to the underside of a transverse bar 40, slidably mounted at each ..of its ends in a bearing block 41 and 42 respectivel The bearin blocks 41 and 42 are adjustab y mounted in 'rackets 43 and 44 secured to the side frames 1 and 1a respectively. Vertical adjustment of the bearing blocks 41 and 42 within the brackets 43 and 44, is effected by means of jack-screws 45 which are provided with lock nuts 46, as shown in Figs. 2 and 3.

Pivoted at a point 47 to each of the bars 40 is a link 48, Fig. 3, whose opposite end is pivoted, at a point 49, to an arm 50 projecting from an eccentric strap '51 rotatably mounted on an eccentric 52. The eccentrics of each battery of brushes are each adj ustably mounted on a short shaft 53 rotatably mounted in bearings 54 secured to the side frame 1 of the machme.

Each of the eccentrics 52 com rises a flan ed eccentric element 55 secure to the sha t 53 and a double eccentric ring 56 ad justably mounted thereon. One flange of the fixed eccentric 55 is provided with worm wheel teeth 57 adapted to be engaged by a worm 58 secured to a short shaft 59 rotatably mounted in bearings 60 on the double eccentric ring 56. Theshaft 59 is provided with a head 61, by means of Which the eccentric ring 56 may be revolved around the eccentric 55, from a position wherein the centre of a circle defining its outside face is coincident with the centre of the shaft 53, as one extreme position to the other extreme position wherein the said centre of the ring 56, the centre of the eccentric 55 and centre of the shaft 53 are all distant from and in lateral alignment with each other, whereby the amount of reciprocation of the various brushes may be minutely controlled and adjusted from zero to the maximum.

Each bearing block 41 is provided with a bracket 62 to which is ivoted, at 63, ajlink 64, the opposite end 0 which is ivoted at 49 to the connecting link 48 and t e arm 50 on the eccentric strap 51. The link 64 is adapted to convert all rotary motion of the eccentric into a horizontal motion of the strap and its associated brush and prevent raising of the respective brush from the surface of web material undergoing treatment.

vEach of the reciprocating brushes is provided with 9. lug 65 extending laterally from each side of the bar 40 thereof and having an aperture 66- therein aligned with a threaded opening 67 in each bearing block 42. A rod 68 is secured in each of the apertures 67 and slidably extends through the respective aligned aperture 66 in the ln s 65. A spring 69 encircles each rod 68 am? is confined be tween each of the lugs 65 and the block 42, for the purpose of absorbing any lost motion between the reciprocating elements connected with the brushes.

The coating table 20 comprises side frames 70, 70 suitably braced by transversely extending bars 71, 71. A wooden platform 72 extends between and is suitably secured to the side frames 70, 70 and is faced with a covering of slate 73 or other wear-resisting material. The apron 15 contacts with the slate facing 73 of the table 20 and is adapted to lie flat thereon in its movement thereover.

The table 20 is adjustable in a substantially vertical direction with respect to the side frames 1 and 1a of the machine and for this purpose a pair of transversely extending shafts 74, 74 are provided, which are rotatably mounted in bearings 75, 75 secured to the frames 1 and 111. Each shaft 74 is provided with an eccentric 76 adjacent each end thereof andengaging ablock 77 secured to the under side of the frames 70, 70. Each shaft 74 is provided with a mitre gear 78 at its end extending beyond the frame 1, and a connecting, shaft 79, provided with mitre gears 80 meshing with the gears 78, 78, is rotatably mounted in bearings 81, 81 secured to the side frame 1 of the machine. A crank 82 or other suitable device is employed for rotating the shafts 74, 74, whereby the table 20, through the action of the eccentrics 76, 76, may be raised or lowered.

Any suitable means may be provided for retaining the table in its adjusted position and for the purpose of illustration I have shown a ratchet wheel 83 secured to one shaft 74, engaged by a pawl 84 pivoted to the frame 1a. 7

Vertical movement of the table 20 is permitted and longitudinal and transverse movement thereof prevented by means of guide ropls 123, 123 secured to the under sideof the table 20 and being adapted to slide in apertured brackets 124, 124 secured to the side frames 1, 1a of the machine.

For the purpose of driving the reciprocating brushes each of the battery drive shafts 53 is provided with a pulley 85. The pulleys 85 are respectively connected by belts 85a, 85b and 850 to drive pulleys 86, 87 and 88. The pulleys 86 and 87 are each secured to one end of a shaft 89, rotatably mounted in bearings 90 secured to the frame of the machine. The pulley 88 is secured to a shaft 91 rotatably mounted in bearings 92 secured to the frame of the machine.

On each of the shafts 89, .89 is a second pulley 93 and on the shaft 91 is a pair of pulleys 94, 94 around each of which and each of the pulleys 93 a belt 95 passes, thereby operatively connecting the shafts 89, 89 and 91. A main pulley 96 is secured to the shaft 91 and is adapted to be operatively connected to any source of power (not shown).

A second main pulley 100 is secured to a shaft 101 rotatably mounted in bearings on the main frames of the machine and is adapted to supply power to the other elements of the machine. Secured to the shaft 101 is a sprocket wheel 102 connected by means of a sprocket chain 103 with a sprocket 104 secured to the shaft 18 whereby the belt 15 is driven. A second sprocket wheel 105 on the shaft 18 is connected by means of a sprocket chain 106 with a sprocket 107 on one of the trunnions of the roller 23, whereby the perforated belt 21 is driven.

On the trunnion 14 of the pipe roller 12 is a sprocket wheel 108 which connects by means of a sprocket chain 109 with a sprocket wheel 110 on the trunnion 9 of the chilled roller 7, a second sprocket 111 thereon being connected by a sprocket chain 112 with an input sprocket wheel 113 on a speed changing device 114, the output sprocket 115 thereof being connected by a chain 116 with a sprocket 117 on the shaft of the color roller 28. The brush 26 is rotated through a train of gears 119,120 and 121, the first of which is secured to the trunnion 9 of the roller 7 and the last thereof is secured to the shaft of the brush 26.

It will be understood that the brush 26 may be adjusted with respect to the roller 7', and the coating material reservoir 27 with the color roll 28 may be adjusted with respect to the brush 26, on the main frame of the machine.

In order to maintain a definite and proper working tension on the web of material as it passes through the machine I provide a special mounting for the roll a; of the material. The roll is provided with a shaft rotatably mounted in bearings 126 at each end thereof and each being secured to a beam 127 mounted on one of the main frames 1, 1a by means of roller bearings 128, 128. A brake drum 129 is secured to one end of the shaft 125 and is operatively engaged and partially encircled by a brake band 130, one end of which is adjustably secured to the beam 127, the other end thereof being pivoted to one leg of a bell crank lever 131 pivotcd at 132 to the beam 127. The other leg 133 of the bell crank lever. is in the form of a wedge and is adapted to have its angular side engaged by a roller 134 rotatably mounted on the frame 1. The opposite end of the beam 127 is provided with a gear rack 135, meshing with a pinion 136, secured to a shaft 137 rotatably mounted in the frame 1. A plain faced wheel 138 is secured to the shaft 137 and has one end of a strap 139 secured thereto, the strap passing around a pulley 140 and having an adjustable weight comprising removable discs 141 suspended on its free end.

The weights 141 tend to force the supporting beams, with the roll 03 and the bell crank, outward until the bell crank is engaged by the roller 134, the arm 133 thereof being depressed and thereby tightening the brake band 130 on the drum 129, retarding the rotation of the roll a; and applying tension to the web 00 As the tension becomes abnormal the entire structure of beams, bell crank and roll are moved inward against the action of the weight by the pull of the web 00 and the brake band 130 is released a certain v extent from the drum 129, permitting further but restricted unwinding of the material from the roll 01:.

The apparatus above described may be employed for applying. various forms of coating material to various kinds of web materials, such, for example, as a fine clay suspended in a suitable carrying fluid and adapted to be applied to a web of paper or cloth for filling the pores of the web.

Having described one embodiment of my invention in detail, various modifications thereto will inevitably present themselves to one familiar with the mechanical arts, therefore, only such limitations should be placed upon the scope of the invention as are prescribed by the appended claim, or dictated by the prior art of record;

I claim:

In a machine for coating Web material, comprising side frames; a coating table having an arched top mounted intermediate said side frames; a pair of transverse shafts rotatably mounted in said side frames below said table; eccentrics on said shafts; bearing blocks on the said table engaging'said eccentrics; a longitudinally extending shaft operatively connected to said transversely extending shafts; means for rotating said shafts, to raise or lower said table and means for retaining the table in the position to which it has been moved.

LYNN B. CASE. 

